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[Remorseless Winter]ωϖ—Slows movement speed by 75%. Also deals 7069 to 7931 Frost damage per second to players within 10 yards of him Debuff on the Lich King for the duration of the encounter.

[Fury of Frostmourne]ωϖ 50,000 yd range—Deals 1,000,000 Shadow damage to all enemies that fail to break the ice wall in time. 2.6 sec cast. Only used if the players fail to escape and the Lich King catches up with them.

The Lich King also creates ice walls to halt the party and raises various Scourge minions to battle them (see the Strategy section, below).

The Lich King raises a series of four ice walls throughout the Hidden Passage to block the escape of the party. At each wall, the Lich King raises groups of undead to attack. The groups consist of the following:

In order to break through each ice wall, the groups of undead must be destroyed. Typically, a half-dozen non-elite ghouls are spawned first, then a few risen witch doctors, and finally a lumbering abomination or three. More and more Scourge are spawned at each wall, so kill quickly and keep close to the guide.

The risen witch doctors must be killed first as they attack from range and may end up behind the Lich King, thus causing a wipe if the group is heavy on melee DPS.

Upon reaching the end of the tunnel to the platform outside, the party finds they are trapped on the ledge - and the Lich King is hot on their heels. Suddenly, their faction gunship (The Skybreaker or Orgrim's Hammer) rises up and opens fire, collapsing the tunnel before the Lich King can reach them. The ship's captain (Justin Bartlett or Korm Blackscar) encourages the party to get on board before the mountainside collapses; a chest with the loot for the encounter is on the deck, as is a portal to Dalaran. If the instance was entered by the Dungeon Finder, the portal will actually lead to wherever you entered from, just as if you used the Dungeon Finder to teleport out.

Orgrim's Hammer's guns open fire on the tunnel, collapsing it. A ramp leading up to the deck is lowered.

Sky-Reaver Korm Blackscar yells: Get onboard, now! This whole mountainside could collapse at any moment.

Lady Sylvanas Windrunner yells: We are safe, for now. His strength has increased ten-fold since our last battle! It will take a mighty army to destroy the Lich King, an army greater than even the Horde can rouse.

There used to be a trick where players could stand on the platform next to the start of the path and have the Lich King pass them. The spawns still target you, but the Lich King walks away from you. As long as you make it outside your faction's ship blasts the mountainside, you are fine. With Patch 3.3.2, The Lich King deals massive damage to players standing in this position.

If you entered the instance using the Dungeon Finder, the portal to Dalaran will not actually lead to Dalaran, but rather to wherever you were before teleporting into the instance. It is unknown whether this is a bug or "working as intended".

There have been a few reported cases of the faction guide (Sylvanas or Jaina) having far less health than she normally would during this encounter. Her health has been known to reach as low as 1. Nonetheless, it is still possible to succeed. In such a scenario, it is actually best to have all party members stay away from the guide, so that any multi-target spells or attacks from the mobs don't accidentally hit her (since her death will result in an instant wipe). It is actually unknown if this is a bug, or dependent on the time it takes the party to reach their guide following Marwyn's defeat. Her health has been known to return to more manageable levels if the party should have to try again.

While not necessarily a bug, players can run past the location of the first ice wall before it is created. If the player is inside the ice wall, they are technically allowed to walk back out and continue as normal. While this does allow the player to get to the airship right away, your faction guide will still be stuck at the ice wall and the party will wipe when the Lich King makes it to her.